The myocardium is the thick, muscular layer of the heart wall responsible for pumping blood throughout the body. It is made up of specialized heart muscle cells called cardiomyocytes, which contract and relax to create the heartbeat. This layer is crucial for maintaining blood circulation and ensuring that oxygen and nutrients reach all parts of the body. In addition to its pumping function, the myocardium is also influenced by the nervous system and various hormones, which help regulate heart rate and strength of contractions. Healthy myocardium is essential for overall heart health, and conditions like cardiomyopathy can weaken this vital muscle, leading to serious health issues.